Moreover, it is flexible depending on the relationship; it lets couples define their own version of fidelity based on what is important to them, as determined through honest, nonjudgmental discussions and mutual decision making.

For some couples, behaviors like looking at porn or flirting on Facebook might be perfectly OK, so long as the couple has agreed that the behavior fits within the boundaries of their relationship and secrets are not being kept.

He is the author of books including Infidelity starts with the mere thought of being intimate with another person other than our spouse or hubby. The fact that some couples are more liberal than others does not changes the label - I assume.

It only means that both parties wants to keep the door open as an excuse for "smaller" infidelities, because none of them are really committed to the other.

Instead, it focuses on what matters most to you, your partner, and your relationship—the emotional distancing, the sense of intimate betrayal, and the loss of trust.